Bulletin No.:

Service Bulletin

Date:

17-NA-394
March, 2021

TECHNICAL
Subject:

Squeak, Clunking Type Noise Heard From Rear of Vehicle

Brand:

Model:

Chevrolet
GMC

Model Year:
from

to

Colorado

2015

2021

Canyon

2015

2021

Involved Region or Country

Condition 1

VIN:
from

to

Engine:

Transmission:

All

All

North America, Thailand, Korea, Peru, Guatemala, Argentina, Venezuela, and South
Africa
Some customers may comment on a squeak type noise heard from the rear of the
vehicle.
Upon further investigation, the technician may diagnose the noise is coming from the rear
suspension leaf spring area.
Note: The breakpoints below are relevant only to this Condition, and the cut off is in the
2019 model year.
Colorado SOP - Prior to 1GCGSCEN6K1241170
Canyon SOP - Prior to 1GTG5CEN8K1239279

Condition 2

Some customers may comment on a clunking type noise heard from the rear of the
vehicle.
Upon further investigation, the technician may diagnose the noise is coming from the rear
suspension leaf spring area.
Colorado SOP thru 2021
Canyon SOP thru 2021

Cause

These conditions may due to debris getting between the leaf springs.

Correction 1

Install new leaf spring inserts following the procedure below.

Correction 2

Re-torque the joints of the leaf spring assembly following the procedure below.

Service Procedure (Condition 1)
Prior to performing this bulletin, follow the procedure for
Noise Diagnosis - Rear Suspension in SI to determine
the source of the noise. Jounce the rear of the vehicle
utilizing J 39570 Chassis Ear or equivalent, to aid in
locating the source of the noise.
If necessary, road test the vehicle.
1. Raise the vehicle on a frame lift-type hoist. Refer to
Lifting and Jacking the Vehicle, in SI.
2. Inspect the springs for damage.
• If damage has been found, refer to Rear Leaf
Spring Replacement, in SI.
• If damage has NOT been found, proceed to the
next step.

5341853

Copyright 2021 General Motors LLC. All Rights Reserved.

Page 2

March, 2021

Bulletin No.: 17-NA-394

3. Install new Rear Leaf Spring Inserts using the
following procedure:

5358883

Caution: Do NOT damage the finish on Leaf Springs.
3.1. On the spring assembly, insert a plastic trim
tool or plastic wedge in between the #1 and
#2 leaf springs, to access the old insert.

5341855

3.2. Push up on insert until it hits the bottom of the
spring above it. Then use a suitable cutting
tool to cut the stem off from the insert.

5341859

Caution: Do NOT damage the surface of the new
insert when trimming.
3.5. Cut the stem of the new insert with a hacksaw
or suitable cutting tool. Make sure to leave 6
mm (0.240 in) of the stem.

5341861

3.6. Apply a small amount of RTV sealer around
the remaining portion of the stem.
3.7. Install the new insert into the leaf spring.
Make sure the stem portion lines up with the
slot in the spring. Remove the plastic trim tool
or plastic wedge to close the spring and seat
the new insert.
4. Repeat step #3 for the 7 remaining inserts.
5. Lower the vehicle to the ground and test drive to
verify the repair.
Important: If the Service Procedure for Condition1
fixes the squeak, DO NOT proceed to Service
Procedure (Condition 2).

Bulletin No.: 17-NA-394

March, 2021

5341856

3.3. Remove the top portion of the insert, and then
remove the bottom portion of the
remaining stem.

5341857

3.4. Using a rag and degreaser, clean any dirt or
grease from between the leaf springs at the
insert location

Page 3

Page 4

March, 2021

Service Procedure (Condition 2)
1. Support the vehicle at curb height when re-torquing
the leaf spring U-bolt nuts.
Note: DO NOT remove the fuel tank.

Bulletin No.: 17-NA-394

2. Loosen the left leaf spring anchor plate U-bolts (1).
3. Re-torque the anchor plate U-bolts (1). Refer to SI
for torque specifications.
4. Repeat steps 2 and 3 for the right side leaf spring.
5. Re-test the vehicle for the same clunking noise. If
the issue remains, follow the regular repair
procedure.

Parts Information
Causal
Part

N/A*

Description

Part
Number

Qty

Leaf Spring Insert

84730971

8

RTV Sealer

88864346
(In Canada,
88861418)

1

*For warranty transactions, DO NOT mark this/these
parts as the Causal Part. Enter the word “Bulletin” in the
Causal Part Description free-flow text field.

4966874

Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage
information.
Labor Operation

Description

Labor Time

8080508*

Rear Leaf Spring Insert Replacement (Condition 1)

0.5 hr.

8080398*

Retorque Bolts / Road Test (Condition 2)

0.6 hr.

*This is a unique Labor Operation for Bulletin use only.

Version

6

Modified

Released December 08, 2017
Revised February 09, 2018 – Updated steps for Service Procedure (Condition 2) and
Warranty Information (Condition 2).
Revised February 13, 2018 – Updated the Warranty Information (Condition 2).
Revised July 11, 2018 – Added 2018–2019 model years.
Revised August 06, 2019 – Updated Procedure, Parts and Warranty Information for
Spring Insert Replacement.
Revised March 04, 2021 – Added 2020–2021 Model Years, Removed Breakpoint from
Condition #2, Updated Export Countries

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION